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UNITED STATES PATENT OFFICE.

\VILLIAM H. BROWVNE, OF BROOKLYN, NEWV YORK.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 326,264, dated September 15, 1885.

Application filed June 11, 1885.

To all whom, it may concern.-

Be it known that LWILLIAM H. BRowNE, of Brooklyn, Kings county, and State of New York, have invented certain new and useful Improvements in Grinding-Mills, of which the following is a specification.

My invention relates to grindingmills, particularly to that class commercially known as the Bogardus Universal Eccentric Mill.

The object of my invention is to cause the mill to properly and continuously grind substances which have been found impracticable to grind heretofore.

1n the drawings, Figure 1 is an elevation, in partial section, of amill embodying myinvention; and Fig. 2 is a detached plan view of the upper mill-plate and ring-plate.

The arrangement and operation of the mill, as shown in the drawings, are as follows: In the frame 1 is arranged a vertical shaft, 2, carrying a pulley, 3, whereby the machine is driven. The upper part of the frame is formed into a case, 19, with a lateral chute, 14. Fixedly secured to the upper extension of the shaft is the lower mill plate or burr, 4. The upper mill plate or burr, 5, is secured to the ringplate 6, which has a central opening, 00, and from the latter extends upward a sleeve or flange, its end 7 fitting closely an opening, y, in a dome-like casing, Sand 9. From the casing projects downward a hollow cylindrical flange, 10, and between this flange and the sleeve is a loosely-fitted collar, 11. The millplates have suitable dress or ribs, 12 13.

It will be observed that the mill-plates are not in contact, nor are they connected in any way. Each plate is caused to rotate on acenter slightly eccentric to the other. Now, upon imparting motion to the driving or lower plate, and feeding through the hollow sleeve the material desired to be ground, the material first impinges upon the lower plate, and is thrown by centrifugal force outward until the accumulation is sufficient to cause the upper plate to also rotate in consequence of the friction thereby developed, when the two plates revolve with a somewhat differential speed, and with a constant shearing action of (No model.)

the ribs 12 and 13 each upon. the other. The material is gradually forced from between the plates and into the spout 14, and thence out; but in attempting to grind such substances as, say, moistened ashes, or material analogous thereto, there is a strong tendency of the pulverized material to fly upward and to gather upon the crown of the casing, where it 001- lectsrapidly and soon clogs the upper millplate and ring-plate, fills the space between the plates and casing, heats the bearing, and finally stops the machine entirely, necessitating the removal of the casing and upper millplate. These objections I have completely obviated by using a wing or scraper, 15, formed to approximately fill the space within the casing, and which rotates with the millplate. The consequence of this is, that the material is dislodged from the crown of the casing as fast as it accumulates, and being constantly acted upon by the wing, the swiftly-rotating air-currents developed thereby,and by the centrifugal force imparted to the particles, the material finally finds egress by gravitating to the space 16, and thence to the spout. The wing is attached to the ring-plate by screws or bolts 17, as shown, as in this wise the device is applicable to and much increases the value of mills of this class already in use.

I claim- In a grinding-mill of the class herein described, the combination,with the lower powerdriven mill-plate, the upper millplate driven thereby, anda ring-plate secured to the upper mill-plate, of a wing, as 15,attached to the ringplate and rotating therewith, the said wing being of such form as to dislodge any accumulation of material from the dome of the casing, the dislodged material finding egress by gravity, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WVM. H. BROWNE.

Witnesses:

JAMEs A. BRANEGAN,

L. E. SPENcER. 

